[j0hnik]

var arr = [9, 9, 9, 111, 5, 2, 5, 3, 4, 4, 5, 7];
arr=arr.filter((el, i)=> { 
var s = 0; 
while (i--) if (el == arr[i]) s++; 
return (s>1&&s<=2); 
}); 
alert(arr);